Disposable transducer apparatus for an electromanometry system
US4557269A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1983 |
| Grant date | Dec 10, 1985 |
| Priority date | — |
| Expiry date | Jun 22, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The disposable transducer includes a small housing constructed of lightweight plastic material. The housing is shaped so as to form a transparent chamber within which is situated a very small piezoresistive strain gauge in the form of a resistive bridge network diffused onto a semiconductor substrate. The semiconductor substrate is electrically isolated by means of a nonconductive gel which partially fills the transparent chamber in which the semiconductor substrate is positioned. The resistive bridge network of the semiconductor substrate is also electrically connected to a plurality of calibration resistors which are separately formed on the semiconductor substrate, making the entire apparatus economically disposable after a single use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.